Have you "physically" connected the audio to your sound card .. otherwise (as I understand it) you won't get audio unless you actually capture something (but as I'm no expert with tv/capture cards I could be mistaken)

It might also be helpful if you could physically inspect the card and list any chip markings/model numbers/pin out\in markings/rear socket types/etc. (it may be a total waste of time too .. but usually the more info you can gather the easier it is to tie down exactly which card you have, as these bt848 cards ID's seem to be pretty generic, yet they all require different settings)

just in case this helps .. "vidmem=" isn't an avaiable parameter for the bttv driver .. here's the available parameters (from "modinfo bttv"):-

Yes you are right, I was looking at the source of bttv.c which must have been an earlier version.I was trying to rectify the Overlay problem with the base memory address.As for the sound, it appears to detect it and loading the drivers for it:

Quote

[ 16.442552] msp3400 6-0040: MSP3410D-B4 found @ 0x80 (bt848 #0 [sw])

But no actual output, which would point to a missing hard wire link to the soundcard.